diff --git a/lib/libc/sys/fcntl.2 b/lib/libc/sys/fcntl.2
--- a/lib/libc/sys/fcntl.2
+++ b/lib/libc/sys/fcntl.2
@@ -53,7 +53,13 @@
 .Fa cmd ,
 .Fn fcntl
 can take an additional third argument
-.Fa "long arg" .
+.Fa arg ,
+which actual type depends on the operation.
+Default type for
+.Fa arg
+is
+.Vt int ,
+unless explicitly noted otherwise.
 .Bl -tag -width F_DUP2FD_CLOEXEC
 .It Dv F_DUPFD
 Return a new descriptor as follows:
@@ -298,6 +304,8 @@
 	int	l_sysid;	/* remote system id or zero for local */
 };
 .Ed
+pointer to which is passed as the third argument
+.Fa arg .
 The commands available for advisory record locking are as follows:
 .Bl -tag -width F_SETLKWX
 .It Dv F_GETLK